In this poll:

This poll was conducted for The Washington Post and the Pew Research Center by telephone November 29 to December 2, 2012, among a random national sample of 1,003 adults, including users of both conventional and cellular phones. The results from the full survey have a margin of sampling error of plus or minus 3.5 percentage points. Sampling, data collection and tabulation by Princeton Survey Research Associates International (PSRAI) of Princeton, NJ.